Improved apparatus foe grinding cutlery



@uiten faire, gaita-4t ffir.

CUTLERY COMPANY.

Letters Patent No. "74,2114, datcd-February'11, 1868.

mrnovrnarranarus roaieemnme GUTLERY.

itin Stimuli referat it inttesttttm patent :mh making gni et its time;

TO -ALL WHOM IT MAY CONCERN i Be it known" that I, WILLIAM Fosxnr, of Meridem-in the county of New Haven, and State of Connecticut, have invented a new Improvement in Apparatus for'Grinding Cutlery; and I do hereby declarcfthe following, when taken in connection with the accompanying drawings, and the letters -ofreference marked thereon, to be a full, clear, -and exact description of the same, and which said drawings constitute part Vof this speeiiication, and represent, inv Figure 1, a front or face view ofthe matrix.

Figure 2, a sidedview, and in Figure 3, a. transverse section, K

`This invention relates to an improvement in machines for grinding cutlery, such as was patented to -me December 26, 1865.- In that invention the matrix which is holding the knife against thcgrindstonc, 'is guided by cams, so as to give to the surface of the knife the peculiar form desired. This requires a very nice, and in many cases a. very diiiicult adjustment, to overcmewhich is the object of the pr'esentinvntion. In the original machine the matrices are formed simply with reference to securely holding the blade while being ground. The present improvement consists in forming the matrix sothat t-not4 only holds the blade, but" dispenses with the adjustment heretofore required to give the desired form to the blade, and so that a matrix,`

. with its blade, may pass directly, and with regular, even movement, to'or across the stone.

To enable others to construct my improvement, I will `proceed to describe ,the cameras illustrated in the accompanying drawings.

A is a bar or plate, upon the surface .of which the matrix is formed, the upper face ofthe plate Abeing level and true. Into this face I form a recess corresponding to the form of theknife, that is tosay, in the'section upon line :c a, as denoted by the black line a, fig. 3, upon section yipas denoted' uponv the red line b, and upon section z z, as denoted upon th'e blue line c,.thus giving to the matrix, below the level surface of the plate,t'he full curvature or taper required for the blade. One side of the bladehaving been properly formed, it is laid Vinto the matrix that side down. In doing this it will bc observed that as the'whole twist, wind, or taper isforme'd in the matrix, the heel of the blade will lie hard down into the matrix, while the point will rise a4 little there-V from, but when `presented to the stone, the pressure upon thestone will spring the point down into the` matrix,`

andthe surface ofthe blade will pass directly and regularly across the stone without any other thanth'e direct forward movement of the matrix, and theblade when completed will have its surfaces form-ed lthe same as in the machine before referred to, and both sides alike. i l

I have described this as having the first sido ofthe blade formed before being placed in the-matrix, but this is not essential, as one matrix may be made a littlc'deeper, so as to leave upon the unground side sufficient material for grinding of that side after the iii-st hasbeen' ground. In either case tho full object-of my invention is accomplished, which is the rigid holding and movement of the die or matrix Without other movement than that required for its passage upon-or across the stone, or other gri-nding-appara. tus.

Having thus fully described my invention, what I claiml as new and useful, and desire to secure bv Letters ,u Constrlmting the matrix .in machines for grinding cutlery, substantially in the manner described, so that aY single and direct movement only is required for the matrix to present the blade to the grindigapparatus;'

Witnesses:Y

JOHN H. SHUMWAY, A. J. Trnm'rs. 

